Gun

Henry Knight keeps a Beretta 92FS Inox for his apparent personal
protection, and the gun is used by John Watson to dispatch The
Hound in the final minutes of The Hounds of Baskerville.

Beretta is an Italian handgun company, and the oldest active
firearms manufacturer in the world. The model 92 handgun was first
introduced in 1975, with multiple variants since released. The 92FS
Inox is distinctive due to its chromed finish.

As with all handguns seen onscreen in Sherlock, private
ownership is strictly prohibited in the United Kingdom under the
Firearms (Amendment) (No. 2) Act 1997.